$(function(){
  // get elem
  let $btn = $('input'),
      delay = 6,
      timer = null;
  
  // init status: disable,text,delay
  $btn.val('同意 (' + delay + 's)');
  $btn.attr('disabled','disabled')
  
  // start timer,timeout button enable
 
  timer = setInterval(()=>{
    // delay > 0
    // set btn text
    // delay ---
    // delay = 0 set btn enable
    $btn.val('同意(' + --delay + 's)');
    if(delay == 0){
      clearInterval(timer);
      $btn.val('同意');
      $btn.removeAttr('disabled');
    }
  },1000);

  // click event
  $btn.click(()=>{
    alert('button clicked!')
  })
});
